H.R. McMaster

Herbert Raymond McMaster (24 July 1962-) was a US Army Lieutenant-General who served as US National Security Advisor from 20 February 2017 to 9 April 2018 (succeeding Michael Flynn and preceding John R. Bolton).

Biography
Herbert Raymond McMaster was born in Philadelphia, Pennsylvania on 24 July 1962, and he graduated from West Point in 1984 and was commissioned into the US Army as a second lieutenant. McMaster authored Dereliction of Duty, which criticized American strategy and military leadership during the Vietnam War, and his book became a popular book among military personnel. He commanded a troop of tanks during the Gulf War, and, at the Battle of 73 Easting, nine tanks of his troop destroyed 28 Iraqi Republican Guard tanks without loss in 23 minutes. McMaster went on to become a military history professor at West Point, a research fellow at the Hoover Institution, a member of the Council on Foreign Relations, a CENTCOM staff officer, and commander of the US 3rd Cavalry Regiment during the Iraq War. McMaster fought against the Iraqi insurgents at Tal Afar before becoming a top counterinsurgency advisor to General David Petraeus, and he continued to rise in the ranks of the top military brass. In February 2017, he succeeded Michael Flynn as National Security Advisor, but he was dismissed in April 2018 due to a rivalry with Secretary of Defense Jim Mattis, who disapproved of McMaster's volcanic and unpredictable temper, and with White House Chief of Staff John F. Kelly.